Probably because you clicked cancel or the X in the top right corner when you closed MP Config. Settings are not saved when you do that.I made a photo of the TV part showing LAV after that I started TV and it didn't use LAV.
Log files please. I can't help without them.Fast, but still lagging. The strangest lag is after pressing STOP, it takes 5 seconds to top the stream, first it continues to play for 2 seconds, then it will stalls at one frame for 3 seconds and finally it stops.